[PATCH RFC v2 05/23] scsi: target: use scoped_with_init_fs() for ALUA metadata

[Christian Brauner]

Use scoped_with_init_fs() to temporarily override current->fs for
the filp_open() call in core_alua_write_tpg_metadata() so the
path lookup happens in init's filesystem context.

core_alua_write_tpg_metadata() ← core_alua_update_tpg_primary_metadata()
← core_alua_do_transition_tg_pt() ← target_queued_submit_work() ←
kworker (target submission workqueue)

Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
---
 drivers/target/target_core_alua.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 10250aca5a81..fde88642a43a 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -18,6 +18,7 @@
 #include <linux/fcntl.h>
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/fs_struct.h>
 #include <scsi/scsi_proto.h>
 #include <linux/unaligned.h>
 
@@ -856,10 +857,13 @@ static int core_alua_write_tpg_metadata(
 	unsigned char *md_buf,
 	u32 md_buf_len)
 {
-	struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
+	struct file *file;
 	loff_t pos = 0;
 	int ret;
 
+	scoped_with_init_fs()
+		file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
+
 	if (IS_ERR(file)) {
 		pr_err("filp_open(%s) for ALUA metadata failed\n", path);
 		return -ENODEV;

-- 
2.47.3